<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style lang="css">
    @import url("https://fonts.googleapis.com/css?family=Raleway:400,400i,700");

    body {
      display: flex;
      height: 100vh;
      justify-content: center;
      align-items: center;
      text-align: center;
      background: #222;
    }

    .reveal {
      position: relative;
      display: flex;
      color: #6ee1f5;
      font-size: 2em;
      font-family: Raleway, sans-serif;
      letter-spacing: 3px;
      text-transform: uppercase;
      white-space: pre;
    }

    .reveal span {
      opacity: 0;
      transform: scale(0);
      animation: fadeIn 2.4s forwards;
    }

    .reveal::before,
    .reveal::after {
      position: absolute;
      content: "";
      top: 0;
      bottom: 0;
      width: 2px;
      height: 100%;
      background: white;
      opacity: 0;
      transform: scale(0);
    }

    .reveal::before {
      left: 50%;
      animation: slideLeft 1.5s cubic-bezier(0.7, -0.6, 0.3, 1.5) forwards;
    }

    .reveal::after {
      right: 50%;
      animation: slideRight 1.5s cubic-bezier(0.7, -0.6, 0.3, 1.5) forwards;
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
        transform: scale(1);
      }
    }

    @keyframes slideLeft {
      to {
        left: -6%;
        opacity: 1;
        transform: scale(0.9);
      }
    }

    @keyframes slideRight {
      to {
        right: -6%;
        opacity: 1;
        transform: scale(0.9);
      }
    }
  </style>
</head>

<body>
  <div class="reveal">sword art online</div>
</body>
<script>
  let duration = 0.8;
  let delay = 0.3;
  let revealText = document.querySelector(".reveal");
  let letters = revealText.textContent.split("");
  revealText.textContent = "";
  let middle = letters.filter(e => e !== " ").length / 2;
  letters.forEach((letter, i) =>
  {
    let span = document.createElement("span");
    span.textContent = letter;
    span.style.animationDelay = `${delay + Math.abs(i - middle) * 0.1}s`;
    revealText.append(span);
  });
</script>

</html>